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<div class="title">far_ptr.h File Reference</div> </div>
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<p><a href="far__ptr_8h_source.html">Go to the source code of this file.</a></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
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Data Structures</h2></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">union  </td><td class="memItemRight" valign="bottom"><a class="el" href="union____far__ptr.html">__far_ptr</a></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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Macros</h2></td></tr>
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<tr class="memitem:a0c227677a96f9bf7e84a90922f2f8708"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#a0c227677a96f9bf7e84a90922f2f8708">TO_FAR_PTR</a>(ofs, seg)   (((<a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>)seg << 16) | (<a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>)ofs)</td></tr>
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<tr class="separator:a0c227677a96f9bf7e84a90922f2f8708"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5bebc5322a1bba1c60c8d60e9b58be14"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#a5bebc5322a1bba1c60c8d60e9b58be14">FAR_SEG</a>(ptr)   (((union <a class="el" href="union____far__ptr.html">__far_ptr</a> *)&ptr)->segofs.seg)</td></tr>
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<tr class="separator:a5bebc5322a1bba1c60c8d60e9b58be14"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab79586d8cc3cb926f363f4d0cf7143d5"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#ab79586d8cc3cb926f363f4d0cf7143d5">FAR_OFS</a>(ptr)   (((union <a class="el" href="union____far__ptr.html">__far_ptr</a> *)&ptr)->segofs.ofs)</td></tr>
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<tr class="memitem:a048cfacb5d37ab758a74f44e86c1dbc6"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#a048cfacb5d37ab758a74f44e86c1dbc6">FAR_FUNC</a>(ptr, typ)   ((typ)(((union <a class="el" href="union____far__ptr.html">__far_ptr</a> *)&ptr)->segfn.fn))</td></tr>
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<tr class="separator:a048cfacb5d37ab758a74f44e86c1dbc6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a7f4ab1893ea392f8bf042a3b97de4730"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#a7f4ab1893ea392f8bf042a3b97de4730">FAR_CALL</a>(ptr, typ, ...)   (<a class="el" href="far__ptr_8h.html#a27792b7fc3796a1e1828d4c5812e5b21">__call_banked_ptr</a>=ptr,((typ)(&<a class="el" href="far__ptr_8h.html#aa45a2312a2584abb8733a052f66b4a90">__call__banked</a>))(__VA_ARGS__))</td></tr>
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Typedefs</h2></td></tr>
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<tr class="memitem:aea7a313c991baf8e28c1d73cf6595209"><td class="memItemLeft" align="right" valign="top">typedef unsigned long </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a></td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:aa45a2312a2584abb8733a052f66b4a90"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#aa45a2312a2584abb8733a052f66b4a90">__call__banked</a> ()</td></tr>
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<tr class="separator:aa45a2312a2584abb8733a052f66b4a90"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a374dd0c7e00bec635f1dd24d5cbe0d35"><td class="memItemLeft" align="right" valign="top">long </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#a374dd0c7e00bec635f1dd24d5cbe0d35">to_far_ptr</a> (void *ofs, int seg)</td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a>
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Variables</h2></td></tr>
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<tr class="memitem:a27792b7fc3796a1e1828d4c5812e5b21"><td class="memItemLeft" align="right" valign="top">volatile <a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#a27792b7fc3796a1e1828d4c5812e5b21">__call_banked_ptr</a></td></tr>
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<tr class="separator:a27792b7fc3796a1e1828d4c5812e5b21"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1344c26ca298a9eadea4bcfea6442ae3"><td class="memItemLeft" align="right" valign="top">volatile void * </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#a1344c26ca298a9eadea4bcfea6442ae3">__call_banked_addr</a></td></tr>
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<tr class="separator:a1344c26ca298a9eadea4bcfea6442ae3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6f1c13e2fad9dd04645a000050d9f382"><td class="memItemLeft" align="right" valign="top">volatile unsigned char </td><td class="memItemRight" valign="bottom"><a class="el" href="far__ptr_8h.html#a6f1c13e2fad9dd04645a000050d9f382">__call_banked_bank</a></td></tr>
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<tr class="separator:a6f1c13e2fad9dd04645a000050d9f382"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Far pointers include a segment (bank) selector so they are able to point to addresses (functions or data) outside of the current bank (unlike normal pointers which are not bank-aware).</p>
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<p>See the <code>banks_farptr</code> example project included with gbdk.</p>
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<dl class="todo"><dt><b><a class="el" href="todo.html#_todo000001">Todo:</a></b></dt><dd>Add link to a discussion about banking (such as, how to assign code and variables to banks) </dd></dl>
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</div><h2 class="groupheader">Macro Definition Documentation</h2>
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<a id="a0c227677a96f9bf7e84a90922f2f8708"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a0c227677a96f9bf7e84a90922f2f8708">◆ </a></span>TO_FAR_PTR</h2>
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<td class="memname">#define TO_FAR_PTR</td>
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<td>(</td>
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<td class="paramtype"> </td>
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<td class="paramname">ofs, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"> </td>
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<td class="paramname">seg </td>
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<td></td>
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<td>)</td>
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<td></td><td>   (((<a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>)seg << 16) | (<a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>)ofs)</td>
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<p>Macro to obtain a far pointer at compile-time </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">ofs</td><td>Memory address within the given Segment (Bank) </td></tr>
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<tr><td class="paramname">seg</td><td>Segment (Bank) number</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>A far pointer (type <a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>) </dd></dl>
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</div>
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<a id="a5bebc5322a1bba1c60c8d60e9b58be14"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a5bebc5322a1bba1c60c8d60e9b58be14">◆ </a></span>FAR_SEG</h2>
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<div class="memitem">
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<td class="memname">#define FAR_SEG</td>
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<td>(</td>
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<td class="paramtype"> </td>
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<td class="paramname">ptr</td><td>)</td>
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<td>   (((union <a class="el" href="union____far__ptr.html">__far_ptr</a> *)&ptr)->segofs.seg)</td>
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</tr>
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</div><div class="memdoc">
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<p>Macro to get the Segment (Bank) number of a far pointer </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">ptr</td><td>A far pointer (type <a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>)</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>Segment (Bank) of the far pointer (type unsigned int) </dd></dl>
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</div>
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</div>
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<a id="ab79586d8cc3cb926f363f4d0cf7143d5"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ab79586d8cc3cb926f363f4d0cf7143d5">◆ </a></span>FAR_OFS</h2>
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<td class="memname">#define FAR_OFS</td>
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<td>(</td>
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<td class="paramtype"> </td>
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<td class="paramname">ptr</td><td>)</td>
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<td>   (((union <a class="el" href="union____far__ptr.html">__far_ptr</a> *)&ptr)->segofs.ofs)</td>
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</div><div class="memdoc">
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<p>Macro to get the Offset (address) of a far pointer </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">ptr</td><td>A far pointer (type <a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>)</td></tr>
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</table>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>Offset (address) of the far pointer (type void *) </dd></dl>
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<a id="a048cfacb5d37ab758a74f44e86c1dbc6"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a048cfacb5d37ab758a74f44e86c1dbc6">◆ </a></span>FAR_FUNC</h2>
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<td class="memname">#define FAR_FUNC</td>
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<td>(</td>
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<td class="paramtype"> </td>
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<td class="paramname">ptr, </td>
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<td class="paramtype"> </td>
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<td class="paramname">typ </td>
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<td>)</td>
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<td></td><td>   ((typ)(((union <a class="el" href="union____far__ptr.html">__far_ptr</a> *)&ptr)->segfn.fn))</td>
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<a id="a7f4ab1893ea392f8bf042a3b97de4730"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a7f4ab1893ea392f8bf042a3b97de4730">◆ </a></span>FAR_CALL</h2>
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<td class="memname">#define FAR_CALL</td>
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<td>(</td>
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<td class="paramtype"> </td>
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<td class="paramname">ptr, </td>
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<td class="paramtype"> </td>
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<td class="paramname">typ, </td>
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<td class="paramname"><em>...</em> </td>
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<td>)</td>
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<td></td><td>   (<a class="el" href="far__ptr_8h.html#a27792b7fc3796a1e1828d4c5812e5b21">__call_banked_ptr</a>=ptr,((typ)(&<a class="el" href="far__ptr_8h.html#aa45a2312a2584abb8733a052f66b4a90">__call__banked</a>))(__VA_ARGS__))</td>
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<p>Macro to call a function at far pointer <b>ptr</b> of type <b>typ</b> </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">ptr</td><td>Far pointer of a function to call (type <a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>) </td></tr>
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<tr><td class="paramname">typ</td><td>Type to cast the function far pointer to. </td></tr>
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<tr><td class="paramname">...</td><td>VA Args list of parameters for the function</td></tr>
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</table>
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</dd>
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</dl>
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<p><b>type</b> should match the definition of the function being called. For example: </p><div class="fragment"><div class="line"><span class="comment">// A function in bank 2</span></div>
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<div class="line"><span class="preprocessor">#pragma bank 2</span></div>
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<div class="line"><span class="keywordtype">int</span> some_function(<span class="keywordtype">int</span> param1, <span class="keywordtype">int</span> param2) __banked { <span class="keywordflow">return</span> 1; };</div>
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<div class="line"> </div>
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<div class="line">...</div>
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<div class="line"><span class="comment">// Code elsewhere, such as unbanked main()</span></div>
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<div class="line"><span class="comment">// This type declaration should match the above function</span></div>
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<div class="line">typedef int (*some_function_t)(int, int) __banked;</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Using FAR_CALL() with the above as *ptr*, *typ*, and two parameters.</span></div>
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<div class="line">result = <a class="code" href="far__ptr_8h.html#a7f4ab1893ea392f8bf042a3b97de4730">FAR_CALL</a>(some_function, some_function_t, 100, 50);</div>
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</div><!-- fragment --><dl class="section return"><dt>Returns</dt><dd>Value returned by the function (if present) </dd></dl>
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</div>
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</div>
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<h2 class="groupheader">Typedef Documentation</h2>
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<a id="aea7a313c991baf8e28c1d73cf6595209"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#aea7a313c991baf8e28c1d73cf6595209">◆ </a></span>FAR_PTR</h2>
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<td class="memname">typedef unsigned long <a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Type for storing a FAR_PTR </p>
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</div>
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</div>
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<h2 class="groupheader">Function Documentation</h2>
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<a id="aa45a2312a2584abb8733a052f66b4a90"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#aa45a2312a2584abb8733a052f66b4a90">◆ </a></span>__call__banked()</h2>
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<td class="memname">void __call__banked </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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</div>
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</div>
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<a id="a374dd0c7e00bec635f1dd24d5cbe0d35"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a374dd0c7e00bec635f1dd24d5cbe0d35">◆ </a></span>to_far_ptr()</h2>
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<td class="memname">long to_far_ptr </td>
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<td>(</td>
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<td class="paramtype">void * </td>
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<td class="paramname"><em>ofs</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int </td>
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<td class="paramname"><em>seg</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Obtain a far pointer at runtime </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">ofs</td><td>Memory address within the given Segment (Bank) </td></tr>
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<tr><td class="paramname">seg</td><td>Segment (Bank) number</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>A far pointer (type <a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a>) </dd></dl>
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</div>
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</div>
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<h2 class="groupheader">Variable Documentation</h2>
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<a id="a27792b7fc3796a1e1828d4c5812e5b21"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a27792b7fc3796a1e1828d4c5812e5b21">◆ </a></span>__call_banked_ptr</h2>
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<td class="mlabels-left">
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<td class="memname">volatile <a class="el" href="far__ptr_8h.html#aea7a313c991baf8e28c1d73cf6595209">FAR_PTR</a> __call_banked_ptr</td>
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</tr>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">extern</span></span> </td>
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</table>
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<a id="a1344c26ca298a9eadea4bcfea6442ae3"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a1344c26ca298a9eadea4bcfea6442ae3">◆ </a></span>__call_banked_addr</h2>
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<td class="memname">volatile void* __call_banked_addr</td>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">extern</span></span> </td>
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<a id="a6f1c13e2fad9dd04645a000050d9f382"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a6f1c13e2fad9dd04645a000050d9f382">◆ </a></span>__call_banked_bank</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="mlabels">
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<td class="memname">volatile unsigned char __call_banked_bank</td>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">extern</span></span> </td>
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</div><div class="memdoc">
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</div>
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</div>
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</div><!-- contents -->
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</div><!-- doc-content -->
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<div class="ttc" id="afar__ptr_8h_html_a7f4ab1893ea392f8bf042a3b97de4730"><div class="ttname"><a href="far__ptr_8h.html#a7f4ab1893ea392f8bf042a3b97de4730">FAR_CALL</a></div><div class="ttdeci">#define FAR_CALL(ptr, typ,...)</div><div class="ttdef"><b>Definition:</b> far_ptr.h:62</div></div>
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